I have been preparing for this question.

https://nvim-orgmode.github.io/ is very good and very customisable while keeping consistent and open file file format that allows your notes to be easily stored and read by other apps.

For longer form notes https://github.com/chipsenkbeil/org-roam.nvim/blob/main/DOCS.org can also help while maintaining all the benefits mentioned above.

There is also https://github.com/nvim-neorg/neorg that is trying to create new file format and ecosystem around it. Seems cool, but a bit new imo.

try marksman or markdown-oxide lsp i used to use markdown-oxide with obsidian worked great, ive ditched obsidian now and solely use nvim+markdown-oxide.

I use obsidian.nvim. It’s a Neovim interface to my Obsidian vaults, so I can work on my knowledge base in whichever app works best in the moment.

I like zk-nvim